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Category Archives: PC Software

Category Archives: PC Software

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Archive file

Computer file used for compression or collection of multiple other files

"File archive" redirects here. For other uses, see file archiver.

A corridor of files at The National Archives

In computing, an archive file is a computer file that is composed of one or more files along with metadata. Archive files are used to collect multiple data files together into a single file for easier portability and storage, or simply to compress files to use less storage space. Archive files often store directory structures, error detection and correction information, arbitrary comments, and sometimes use built-in encryption.

Applications[edit]

Archive files are particularly useful in that they store file system data and metadata within the contents of a particular file, and thus can be stored on systems or sent over channels that do not support the file system in question, only file contents – examples include sending a directory structure over email.

Beyond archival purposes, archive files are frequently used for packaging software for distribution, as software contents are often naturally spread across several files; the archive is then known as a package. While the archival file format is the same, there are additional conventions about contents, such as requiring a manifest file, and the resulting format is known as a package format. Examples include deb for Debian, JAR for Java, and APK for Android.

Features[edit]

Features supported by various kinds of archives include:

Some archive programs have self-extraction, self-installation, source volume and medium information, and package notes/description.

The file extension or file header of the archive file are indicators of the file format used. Computer archive files are created by file archiver software, optical disc authoring software, and disk image software.

Archive formats[edit]

An archive format is the file format of an archive file. Some formats are well-defined by their authors and have become conventions supported by multiple vendors and communities.

Types[edit]

  • Archiving only formats store metadata and concatenate files.
  • Compression only formats only compress files.
  • Multi-function formats can store metadata, concatenate, compress, encrypt, create error detection and recovery information, and package the archive into self-extracting and self-expanding files.
  • Software packaging formats are used to create software packages that may be self-installing files.
  • Disk image formats are used to create disk images of mass storage volumes.

Examples[edit]

Further information: List of archive formats and Comparison of archive formats

Filename extensions used to distinguish different types of archives include zip, rar, 7z, and tar, the first of which is the most widely implemented.

Java also introduced a whole family of archive extensions such as jar and war (j is for Java and w is for web). They are used to exchange entire byte-code deployment. Sometimes they are also used to exchange source code and other text, HTML and XML files. By default they are all compressed.

Error detection and recovery[edit]

Archive files often include parity checks and other checksums for error detection, for instance zip files use a cyclic redundancy check (CRC). RAR archives may include redundant error correction data (called recovery records).

Archive files are sometimes accompanied by separate parity archive (PAR) files that allow for additional error detection and recovery, particularly in recovery of missing files in a multi-file archive.

See also[edit]

References[edit]

External links[edit]

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Category Archives for "Computer Software"

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Microsoft Manual: Microsoft Project

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Common Myths About Private Web Browsing

When it comes to private browsing however there are a few misconceptions and common myths. These are important things to know if you want to feel safe surfing in whatever browser you prefer. Learn more in our latest blog post which aims to highlight some of the common myths around private web browsing.

How to Perform Your Own PC Health Check

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Top Tech Trends For

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Optimising Your PC for Improved Business Performance

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Math Archives Homepage

Mathematics Archives Collection of Software, Abstracts and Reviews

For most of the software packages contained in the Mathematics Archives and for many commercial packages, there are abstracts, reviews, references to reviews, and the author's readme files. These materials are organized in four different ways:

1. First by platform and then by subject.
At the present time, there are two specific platforms in this category:

2. Interactive Texts.
Interactive texts are a new breed of media in which the reader uses a commercial package (such as Mathematica, Maple or Mathkit) to interact with an electronic text.

3. By packages.
The multi-platform category contains materials for a variety of platforms including UNIX machines. This area also contains mirrors of various sites and links to the original sites.

4. By subject.
At the present time, Life Sciences is the only subject in this area.

Links to Other Software Sites

Check out our WWW page which contains links to other software sites which contain packages of interest for mathematicians and which link lets you restrict the listing to computer platform and/or "level" of mathematics. You might prefer to examine the complete list of all software sites.

GAMS
The Guide to Available Mathematical Software project of the National Institute of Standards and Technology (NIST) studies techniques to provide scientists and engineers with improved access to reusable computer software which is available to them for use in mathematical modeling and statistical analysis. One of the products of this work is an on-line cross-index of available mathematical software. This system also operates as a virtual software repository. That is, it provides centralized access to such items as abstracts, documentation, and source code of software modules that it catalogs; however, rather than operate a physical repository of its own, GAMS provides transparent access to multiple repositories operated by others.

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Category Archives: PC Software

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